War Letters http://warletters.net Based on research for the forthcoming War Letters 1914–1918 series, the site has links to a vast range of free, primary and secondary historical sources about the First World War, all available online. These include official histories, government reports and documents, service records, bibliographies, theses, legislation, memoirs, letters and diaries, films, maps, images and much more. I think most people will be truly surprised at how much material is available. The site has separate sections for the Western Front, Gallipoli, Mesopotamia, the War at Sea and the War in the Air.